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Zn1 - xCoxFe2O4 (x = 0-1 in a step of 0.2) nanoparticles with different range of particle size including 5-10 nm and 200-250 nm have been prepared by sol-gel process. Mössbauer spectra at room temperature indicated that, with increasing cobalt content, there is a transition from paramagnetic to magnetically ordered-ferrimagnetic state. Magnetic properties were measured at 300 and 10 K using a Quantum Design MPMS-5S SQUID magnetometer. It was found that with an increase in cobalt content the saturation magnetization and coercivity increase. [ABSTRACT FROM AUTHOR]

Highlights: [•] Co2+ substituted lithium ferrite. [•] Structure changes from order to disorder. [•] Coercivity increased with Co2+ substitution. [•] Blocking temperature increased whereas Curie temperature decreased with Co2+ substitution. [Copyright &y& Elsevier]